Automattic/socket.io — pull request #1655 by ysmood (2014-06-29 13:44:14+00:00)
Title: We should use the standard http protocol to handler the etag header

We should use the standard http protocol to handler the etag header. The 'headers.etag' in newer versions of express.js will not work anymore. Besides, people should not have to depend on express.js to use socket.io.